Denali National Park area in Alaska. Guided whitewater raft trips. Established in 1974, Denali Raft Adventures, Inc. is the original raft company on the Nenana River at the entrance of Denali National Park. We offer Gore-Tex drysuits for the utmost in comfort, neoprene boots, Coast Guard approved lifejacket, and a guided 18ft or 16ft raft which allows you to experience a sense of adventure and fun for an activity that has inherent risks.